System and method for providing data security in a hosted service system

ABSTRACT

Aspects of the present disclosure are directed to methods and systems for protecting sensitive data in a hosted service system. The system includes a host system and the host system includes a key management system (KMS) and a metadata service system (MSS). The KMS and the MSS are communicatively coupled to each other. The system further includes a database management system (DBMS) having a database, a query pre-parser, and a results handler. The query pre-parser and the results handler are communicatively coupled to the KMS and the MSS, and the system also includes a processing application adapted to process at least some data received from a tenant system.

BACKGROUND

A hosted service system is a client-server architecture where certaintools, services or applications are hosted at the server side, and oneor more client systems (also called tenant systems) are coupled to theserver, also called a host, over a network. The server could be, forexample, a virtual server or a real server. The tenant system or theclient system may have multiple clients. The clients may use some or allof the services provided by the host server, on an as-needed basis. Oneof the advantages of this architecture is that the client(s) do(es) nothave to buy and/or maintain the infrastructure to support the tools orapplications. The other advantage is that the clients can use onlyrelevant parts/services of the applications on an as need basis.

In hosted service systems, security of the tenant system data continuesto be an issue and to some degree, an inhibitor for adoption. The“Software as a Service” (SaaS) model, or Cloud computing model, can beviewed as an example of a hosted system services. Even though there arecost advantages to this model, as the industry enters a new of wave ofawareness and adoption, it is typical for the consumers/clients of thehosted applications still to be wary and unsure if their data will besecure with the vendor/host of the service.

Many of the SaaS vendors have managed to mitigate security threats fromexternal sources, and making sure that tenants' have limited access totheir own data and that no other tenant system or user can access datathey are not supposed to view. However, security issues persist, in thatthe tenant system data, including possibly sensitive data, is stillvulnerable from internal security threats posed by internal systems ofthe host, for example, administrators of the databases and/orapplications at the host.

Typically, the vendor/host assures a client at the tenant system thatall the data is stored as encrypted data in the host database. As iswell known, various encryption methodologies exist to encrypt the datastored in the host database. The public key infrastructure (PKI) and theData Encryption Standard (DES) are known examples of encryptionmethodologies. The vendor/host may also secure the data while the datais sent across on the network. The data is encrypted using transportlayer protocols, such as, for example, the Secure Socket Layer (SSL)protocol. Transport Layer Security (TLS) is another cryptographicprotocol well studied in the prior art that facilitates providingsecurity and data integrity for communications over TCP/IP networks suchas the Internet. TLS and SSL encrypt the segments of network connectionsat the transport layer end-to-end. Several versions of the protocols arein wide-spread use in applications like web browsing, electronic mail,Internet faxing, instant messaging and Voice-over-IP (VoIP).

However, an issue that continues to remain unsolved is that theapplication or software that processes tenant system data at thevendor/host system continues to have access to unencrypted sensitivedata of the tenant system, leading to security concerns. Existingmethodologies, however, appear to only partially resolve the securityissue as the encryption logic still resides with the host/vendor.

Some other prior art approaches use symmetric and asymmetric keys forthe hosted systems. However, those solutions do not appear to not solvethe host security issue.

BRIEF SUMMARY

Aspects of the present disclosure are directed to systems and methodsfor protecting sensitive data in a hosted service system.

According to a one aspect of the present disclosure, a hosted servicesystem for protecting sensitive data is provided. The system includes ahost system and the host system includes a key management system (KMS)and a metadata service system (MSS). The KMS and the MSS arecommunicatively coupled to each other. The system further includes adatabase management system (DBMS) having a database, a query pre-parser,and a results handler. The query pre-parser and the results handler arecommunicatively coupled to the KMS and the MSS, and the system alsoincludes a processing application adapted to process at least some datareceived from a tenant system.

A second aspect of the present disclosure involves a hosted servicesystem for protecting sensitive data. The system includes a host system,where the host system is one of a virtual server or a real server. Thehost system includes a federation server and a database managementsystem (DBMS). The DBMS has a database, a query pre-parser, where thequery pre-parser is adapted to receive, via the federation server,communications from a key management system (KMS) and a metadata servicesystem (MSS) associated with a tenant system. The host system is adaptedto process at least some of the data of the tenant system. The querypre-parser is adapted to receive a query, receive, from the MSS, adetermination if the query received by the query pre-parser has a partof the query associated with the sensitive data. If the part of thequery is associated with the sensitive data, receive, from the KMS, atleast one encryption key corresponding to the part of the query, decryptthe part of the query using the at least one encryption keycorresponding to the part of the query, generate a modified query, wherethe modified query includes the decrypted part of the query, andgenerate a database query (DB query) using at least one of the query orthe modified query. The DB query is transmitted to the database. Thesystem further includes a results handler, and the query pre-parser andthe results handler are both communicatively coupled to the federationserver.

A third aspect of the present disclosure involves a hosted servicesystem for protecting sensitive data. The system includes a host system,where the host system is one of a virtual server or a real server, afederation server and a database management system (DBMS). The DBMS hasa database, a query pre-parser, where the query pre-parser is adapted toreceive, via the federation server, communications from a key managementsystem (KMS) and a metadata service system (MSS) associated with atenant system where the host system is adapted to process at least someof the data of the tenant system. The query pre-parser is adapted toreceive a query, receive, from the MSS, a determination if the queryreceived by the query pre-parser has a part of the query associated withthe sensitive data. If the part of the query is associated with thesensitive data, receive, from the KMS, at least one encryption keycorresponding to the part of the query, decrypt the part of the queryusing the at least one encryption key corresponding to the part of thequery, generate a modified query, where the modified query includes thedecrypted part of the query, generate a database query (DB query) usingat least one of the query or the modified query, and transmit the DBquery to the database. The system further includes a results handler,where the query pre-parser and the results handler are bothcommunicatively coupled to the federation server.

A fourth aspect of the present disclosure involves a method forprotecting sensitive data in a hosted service system, where the hostedservice system includes a host system adapted to receive data from atenant system, the tenant system being communicatively coupled to thehost system via a communication network, and where the sensitive data issome of the data of the tenant system. The method includes receiving aclient request from a client associated with the tenant system anddetermining if a part of the client request is associated with thesensitive data, where the determination is performed by a metadataservice system (MSS), and where the MSS is adapted to maintain metadataof the sensitive data, where the metadata includes encryptioninformation. If the part of the client request is associated with thesensitive data, receive, from a key management system (KMS), at leastone encryption key corresponding to the part of the client request,where the KMS is adapted to function as a repository of encryption keys,the encryption keys being used to encrypt the sensitive data, encryptthe part of the client request using the at least one encryption keycorresponding to the part of the client request and generate a modifiedclient request, where the modified client request includes the encryptedpart of the client request. The method further includes generating atenant request by manipulating at least one of the client request or themodified client request, where the manipulation is performed using adata exchange format, transmitting the tenant request, routing thetenant request as a query and receiving the query, where the receivingis performed by a query pre-parser, and where the host system includesthe query pre-parser. The method also includes determining if the queryreceived by the query pre-parser has a part of the query associated withthe sensitive data, where the determination is performed by the MSS. Ifthe part of the query is associated with the sensitive data, receiving,from the KMS, at least one encryption key corresponding to the part ofthe query, decrypting the part of the query using the at least oneencryption key corresponding to the part of the query and generating amodified query, where the modified query includes the decrypted part ofthe query. Further, the method includes generating a database query (DBquery) using at least one of the query or the modified query andtransmitting the DB query to the database.

A fifth aspect of the present disclosure involves a system forprotecting data. The system includes a first system, where the firstsystem is one of a virtual server or a real server. The first systemincludes a key management system (KMS), a metadata service system (MSS),the KMS and the MSS being communicatively coupled to each other and adatabase management system (DBMS). The DBMS has a database, a querypre-parser and a results handler, where the query pre-parser and theresults handler are communicatively coupled to the KMS and the MSS. Thefirst system is adapted to receive, via a network, data from a secondsystem having an associated client, where the first system is adapted toprocess at least some data of the second system.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present disclosure are described in detail below, byway of example only, with reference to the following schematic drawings,where:

FIG. 1 shows a schematic of a hosted service system found in prior art;

FIG. 2 schematically illustrates a hosted service system rendered as adelegated hosted service system, according to an embodiment of thedisclosure;

FIG. 3 schematically illustrates a hosted service system rendered as afederated hosted service system, according to an one embodiment of thedisclosure;

FIG. 4 shows a methodology for protecting sensitive data in a hostedservice system while the sensitive data is being fetched from a hostsystem, according to an embodiment of the disclosure;

FIG. 5 shows a methodology for protecting sensitive data in a hostedservice system while the sensitive data is being transmitted from atenant system to a host system, according to an embodiment of thedisclosure; and

FIG. 6 shows detailed schematic of a computer system used for protectingsensitive data in hosted service systems as disclosed in FIG. 2 and FIG.3.

DETAILED DESCRIPTION

Aspects of the disclosure describe, in various exemplary embodiments,systems and methods for protecting sensitive data in a hosted servicesystem.

FIG. 1 illustrates a prior art schematic of a hosted service system 100.The hosted service system 100 includes a tenant system 102 and a hostsystem 120. In the hosted service system 100, as an example, an companydata management system has been offered as a hosted service (such as,for example, SaaS) to the tenant system 102 and company data resides inthe host system 120 (also alternatively referred to herein as “avendor”). The company data management system may include sensitive data(e.g., upcoming product plans, company confidential information, etc.)that a consumer of the service, in this case a client 104 of the tenantsystem 102, would prefer to keep confidential even from the host system120.

The tenant system 102 and the host system 120 are communicativelycoupled via a network and are separated by a firewall 106. The tenantsystem is adapted to have a plurality of clients even though in theexemplary tenant system 102 of FIG. 1, only one client 104 is shown.

The host system 120 includes a user registry and access controlmanagement element (UR-ACM) 124, a processing application 122, adatabase management system (DBMS) 126, and an encrypted data element128. The UR-ACM 124 is adapted to authenticate a user of the client 104.This authentication occurs via a communication link 121 between thetenant system 102 and the UR-ACM 124. A tenant request 103 istransmitted from the tenant system 102 to the host system 120 in asecure manner, as indicated by the letter “L” in brackets as (L) next to103. The secure transmission is facilitated by the firewall 106 and alsoby the encryption using transport layer protocols, such as, for example,the Secure Socket Layer (SSL) protocol. The processing application 122is adapted to communicate with the UR-ACM 124 via a communication link123 and is adapted to process a tenant request 103 and transmit a queryvia a communication link 125 to the DBMS 126. The communication link 125is shown having a notation (O) (for example, 125(O)) indicating that itis not secure and that it is open.

The DBMS 126 communicates with an encrypted data element 128 by sendinga secure query 127 to receive a secure query result 129 from theencrypted data element 128. Various encryption methodologies exist toencrypt the data stored in the encrypted data element 128. The publickey infrastructure (PKI) and the Data Encryption Standard (DES) are wellknown examples of encryption methodologies in the prior art. The securequery 127 and/or the secure query result 129 may include sensitive data,such as, for example, salary data. This sensitive data is secure asindicated by a notation (L) next to both the secure query 127 and thesecure query result 129. Further, the processing application 122processes the result from the DBMS and processes the result to sendcommunication to the tenant system 102 via a communication link 105across the firewall 106. This communication link 105 is again secure asindicated by (L) next to 105. This security is facilitated by varioustransport layer protocols, such as, for example SSL.

Even though the sensitive data is secure while the data is transmittedvia communication links 103 and 105 or sent as the secure query 127 andreceived as the secure query result 129, when the DBMS 126 communicateswith the processing application 122, the communication link 125 is notsecure and hence the internal users of the host system 120 may haveaccess to the sensitive data of the client 104. The internal users canbe the database administrators of the DBMS 126 or the consumers of theprocessing application 122 or both.

FIG. 2 illustrates a schematic of a hosted service system rendered as adelegated hosted service system 200, according to one embodiment of thepresent disclosure. The delegated hosted service system for protectingsensitive data in a hosted system is described. The delegated hostedservice system 200 includes a tenant system 202 and a host system 230.The host system 230 is adapted to process at least some data of thetenant system 202. The tenant system 202 and the host system 230 arecommunicatively coupled to each other over a network (not shown) and afirewall 216. For the purposes of this document, the sensitive data is asubset of data residing in the hosted service system. In an exemplarymode, a client of the tenant system 202 may define the sensitive data.

The tenant system 202 includes a plurality of clients 204, one of whichis shown, and a proxy 206. The proxy 206 is adapted to (a) receive andprocess a client request 208 from the client 204, (b) transmit theprocessed client request as a tenant request 212 to the host system 230,and (c) receive and process a host response 214 from the host system 230and transmit the processed host response as a client response 210 to theclient 204.

The host system 230 can be a real server or a virtual server. The hostsystem 230 includes a database management system (DBMS) 244. The DBMS244 further includes a database 248, a results handler 246 and a querypre-parser 250. The results handler 246 is adapted to process a databasequery result (DB query result) 256 from the database 248 and transmit aquery result 258. The query pre-parser 250 is adapted to process a query252 and transmit a database query (DB query) 254 to the database 248.

The host system 230 further includes a user registry and access controlmanagement element (UR-ACM) 232. The UR-ACM 232 is adapted toauthenticate a user of the client 204.

The host system 230 is further adapted to include a processingapplication 238. The processing application 238 further includes arequest builder 242 and a response builder 240. The request builder 242is adapted to process a tenant request 212 from the tenant system 202and route the processed request as a query 252 to the query pre-parser250. The response builder 240 is adapted to process a query result 258from the results handler 246 and route the processed query result as ahost response 214 to the proxy 206.

The host system 230 further includes a key management system (KMS) 234and a metadata service system (MSS) 236, wherein the KMS 234 and the MSS236 are communicatively coupled to each other. The KMS 234 and the MSS236 both are communicatively coupled to the UR-ACM 232. The delegatedhosted service system 200 is adapted to enable communication between theresults handler 246 and the KMS 234 and MSS 236. The delegated hostedservice system 200 is further adapted to enable communication betweenthe query pre-parser 250 and the KMS 234 and the MSS 236. The processingapplication 238 is adapted to be communicatively coupled to the KMS 234,the MSS 236 and the UR-ACM 232.

The KMS 234 is adapted to function as a repository of encryption keys,wherein the encryption keys are used to encrypt sensitive data of thetenant system 202, wherein the sensitive data is at least a part of thedata of the tenant system 202. At least one encryption key isadministered by the tenant system 202.

In one embodiment, the KMS 234 is a repository of symmetric keys used toencrypt sensitive data. The tenant system 202 may control access to thesymmetric keys in a delegated administration mode and correspondingrequests and responses are logged. A symmetric key is assigned perclient 204 per role. It is possible that the same client 204 may havedifferent roles, such as, for example, as an administrator, and as anaccess control based role, such as a “read only” role. Every role perclient 204 has a corresponding database user. The KMS 234 has thecapability of generating new set of keys (refreshing the key set) forevery client 204 of the tenant system 202 based on a set of configurableparameters.

In one embodiment, when the processing application 238 requests the keyfor inclusion in its response to the client 204, the key is encryptedusing the public key of the client 204 and the role as describedearlier. This is to isolate the access of the processing application 238to the sensitive data.

The MSS 236 is adapted to maintain metadata of the sensitive data,wherein the metadata includes encryption information. In an embodimentof the present disclosure, a configuration interface (not shown) may beused by the client 204 of the tenant system 202 to define this metadata.The configuration interface abstracts the metadata so that the client204 can configure it. For example, a column in a table can be mapped toan attribute in the configuration interface. Only the client 204 isenabled to query and update the metadata included in the MSS 236.However, updates to metadata may have to be scheduled by anadministrator of the host system 230. The administrator of the hostsystem 230 may need to evaluate the effects of changes to metadata(existing applications which already use the current metadata may haveto be gracefully terminated and some other processes may have to berestarted) and will schedule the metadata update accordingly.

The client 204 may upload the changed metadata to the MSS 236. Thechanges, however, may not get committed immediately. Instead, theadministrator of the host system 230 may be notified that a metadataupdate for the client 204 has been requested. The administrator of thehost system 230 then can schedule the update for a given time (afterperforming related administrative tasks) and notify the client 204 viathe configuration interface that the update has been scheduled for aspecific time. Once the scheduled update has been committed by the MSS236, the MSS 236 sends out notifications to the administrator of thehost system 230 and an administrator of the tenant system 202 that themetadata update has been committed successfully (or not).

The query pre-parser 250 is adapted to receive a query 252. Adetermination is made by the MSS 236 if the query 252 has a part of itassociated with the sensitive data. If part of the query 252 isdetermined to be associated with the sensitive data then at least oneencryption key corresponding to that part of the query 252 is receivedfrom the KMS 234. By using the at least one encryption key receivedcorresponding to sensitive data part of the query 252, decryption ofthat part of the query 252 is performed, and the decrypted part of thequery 252 is included in a modified query. Using at least one of themodified query or the query 252, the query pre-parser 250 generates a DBquery 254 that is transmitted to the database 248.

The results handler 246 is adapted to receive a DB query result 256 fromthe database 248. A determination is made by the MSS 236 if a part ofthe DB query result 256 is associated with the sensitive data. If thepart of the DB query result 256 is determined to be associated with thesensitive data, at least one encryption key corresponding to the part ofthe DB query result 256, is received from the KMS 234 and using the atleast one encryption key received corresponding to the part of the DBquery result 256, encryption of the part of the DB query result 256 isperformed and then the encrypted part of the DB query result 256 isincluded in a modified DB query result. Using at least one of themodified DB query result or the DB query result 256, the results handler246 generates a query result 258. The query result 258 is transmitted tothe response builder 240. As described before, the response builder 240is adapted to process the query result 258 from the results handler 246and route the processed query result as the host response 214 to theproxy 206.

The proxy 206 is adapted to receive the host response 214. Adetermination is performed by the MSS 236 if the host response 214 has apart of the host response 214 associated with the sensitive data of thetenant system 202. If the part of the host response 214 is determined tobe associated with the sensitive data then at least one encryption keycorresponding to the sensitive data part of the host response 214 isreceived from the KMS 234 and, using the at least one encryption keyreceived corresponding to the sensitive data part of the host response214, decryption of the sensitive data part of the host response 214 isperformed and the decrypted sensitive data part of the host response 214is included in a modified host response. By manipulating at least one ofthe modified host response or the host response 214, the proxy 206generates a client response 210. The manipulation may be performed usinga data exchange format. The client response 210 is transmitted to theclient 204.

The proxy 206 is adapted to receive the client request 208 from theclient 204. A determination is performed by the MSS 236 if a part of theclient request 208 is associated with the sensitive data of the tenantsystem 202. If the part of the client request 208 is determined to beassociated with the sensitive data, at least one encryption keycorresponding to the sensitive data part of the client request 208 isreceived by the proxy 206 from the KMS 234. By using the at least oneencryption key received corresponding to the sensitive data part of theclient request 208, encryption of the sensitive data part of the clientrequest 208 is performed and the encrypted sensitive data part of theclient request 208 is included in a modified client request. Bymanipulating at least one of the modified client request or the clientrequest 208, the proxy 206 generates a tenant request 212. Themanipulation may be performed using a data exchange format. The tenantrequest 212 is transmitted to the request builder 242.

The proxy 206 may be a request and response interceptor and manipulator.Based on the content type of the request or the response, the proxy 206uses an appropriate XML parser/HTML parser or other parser. The parserlooks for appropriate tags and decrypts the data inside the tag.

In the case of HTML content interception and manipulation, theimplementation by the proxy 206 can be a browser plug-in. In the case ofthe manipulation of the host response 214 from the host system 230, anencrypted symmetric key can be used for decrypting the data that isreceived as part of the HTTP header. The key is encrypted using thepublic key of the client 204. The proxy 206 typically uses the privatekey of the client 204 to decrypt the host response 214. In the case ofthe manipulation of the client request 208, the key to be used toencrypt the data is obtained by querying the KMS 234. Once the key isobtained, it is passed on to the parser for encrypting/decryptingsensitive data.

The key and the HTML content are passed on to the HTML parser. The HTMLparser looks for “marked” HTML fields, for example, a <div> field withan identification attached to it. When the HTML parser encounters the<div> field, the HTML parser encrypts/decrypts the content of the fieldusing the key supplied to it.

In the case of XML content interception and manipulation, the symmetrickey to be used for decrypting the data can be typically part of, as anexample, the EncryptedData′ element. The XML parser looks forEncryptedData′ elements and decrypts XML element content (characterdata) and replaces it with the decrypted character data. This can beimplemented as an extension to existing parsers or the SOAP Engine.

FIG. 3 illustrates a schematic of a hosted service system rendered as afederated hosted service system 300, according to an exemplaryembodiment of the present disclosure. The federated hosted servicesystem 300 for protecting sensitive data in a hosted service system isdescribed. The federated hosted service system 300 includes a tenantsystem 302 and a host system 330 communicatively coupled to each otherover a network and a firewall 216. Elements, components and theircorresponding functions of the tenant system 202 and the host system 230of FIG. 2 are identical to the tenant system 302 and the host system ofFIG. 3 respectively. Only the differences will be described in detail.

The host system 330 includes a federation server 308. The federationserver 308 is communicatively coupled to the query pre-parser 250, theresults handler 246 and the UR-ACM 232. The tenant system 302 includesthe KMS 304 (234 of FIG. 2) and MSS 306 (236 of FIG. 2). The KMS 304 andthe MSS 306 are communicatively coupled to each other. The KMS 304 andthe MSS 306 are both communicatively coupled to the federation server308 via the proxy 206. The query pre-parser 250 and the results handler246 are both communicatively coupled to the KMS 304 and the MSS 306 viathe federation server 308. The processing application 238 iscommunicatively coupled to the federation server 308.

In an exemplary federated hosted service system embodiment, theretrieval of the keys from the host system 330 by the proxy 206 andinclusion of the key in the host response 214 from the response builder240 can be completely avoided. The proxy 206 may instead fetch the keysfrom the KMS 304 hosted inside the firewall 216 of the tenant system302. The federation server 308 will request keys from the KMS 304 hostedat the tenant system 302 as required.

FIG. 4 shows a flow chart illustrating a general process 400 forprotecting sensitive data in a hosted service system, while thesensitive data is being fetched from a host system 230 (FIG. 2),according to an embodiment of the present disclosure. The exemplaryhosted service system is a delegated hosted service system 200 asdescribed in FIG. 2 and it includes the host system 230 and a tenantsystem 202 (FIG. 2). It should be noted that according to anotherembodiment of the disclosure, the sensitive data fetching from a hostsystem 330 can be performed using a federated hosted service system 300as described in FIG. 3.

As depicted in block 402, a user of a client 204 (FIG. 2) isauthenticated, wherein the tenant system 202 includes the client 204,and wherein the authentication is performed by a user registry andaccess control management element (UR-ACM) 232 (FIG. 2), and wherein thehost system 230 includes the UR-ACM 232. Block 404 depicts routing aclient request 208 (FIG. 2) from the client 204 to the database 248(FIG. 2). Since the client request 208 in the exemplary method does nothave any sensitive data, the client request 208 is not encrypted by aproxy 206 (FIG. 2), wherein the proxy 206 is included in the tenantsystem 202, and a query 252 (FIG. 2) is transmitted to the database 248.According to another embodiment of the present disclosure, a requestbuilder 242 (FIG. 2) of a processing application may use the clientrequest 208 and generate a query 252 which is then transmitted to thedatabase 248.

Block 406 depicts a results handler 246 (FIG. 2) receiving a databasequery result (DB query result) 256 (FIG. 2) from the database 248,wherein the host system 230 includes the database 248. Block 408 depictsdetermining if a part of the DB query result 256 is associated with thesensitive data, wherein the determination is performed by a metadataservice system (MSS) 236 (FIG. 2), and wherein the MSS 236 is adapted tomaintain metadata of the sensitive data, and wherein the metadataincludes encryption information. If the part of the DB query result 256is associated with the sensitive data then the results handler 246receives, from a key management system (KMS) 234 (FIG. 2), at least oneencryption key corresponding to the part of the DB query result 256. TheKMS 234 is adapted to function as a repository of encryption keys, theencryption keys being used to encrypt the sensitive data. The part ofthe DB query result 256 is encrypted using the at least one encryptionkey corresponding to the part of the DB query result 256. A modified DBquery result is generated, wherein the modified query result includesthe encrypted part of the DB query result 256.

Block 410 depicts generating a query result 258 (FIG. 2) using at leastone of the DB query result 256 or the modified DB query result. Block412 depicts the results handler 246 transmitting the query result 258.In block 414, generating a host response 214 (FIG. 2) using the queryresult 258, wherein generating is performed by a processing application238 (FIG. 2), wherein the processing application 238 is communicativelycoupled to the MSS 236, the KMS 234 and the UR-ACM 232, and wherein thehost system 230 includes the processing application 238, is depicted.Block 414 also depicts routing the host response 214 by the processingapplication 238 to the tenant system 202. Block 416 depicts the proxy206 receiving the host response 214.

Block 418 depicts determining if a part of the host response 214 isassociated with the sensitive data, wherein the determination isperformed by the MSS 236. If the sensitive data part of the hostresponse 214 is associated with the sensitive data, then the proxy 206receives, from the KMS 234, at least one encryption key corresponding tothe sensitive data part of the host response and decrypts the sensitivedata part of the host response 214 using the at least one encryption keycorresponding to the sensitive data part of the host response 214, andgenerates a modified host response, wherein the modified host responseincludes the decrypted sensitive data part of the host response 214.Block 420 depicts generating a client response 210 (FIG. 2) bymanipulating at least one of the host response 214 or the modified hostresponse, wherein the manipulation may be performed using a dataexchange format. Block 422 depicts transmitting the client response 210to the client 204.

FIG. 5 shows a flow chart illustrating a general process 500 forprotecting sensitive data in a hosted service system, while thesensitive data is being transmitted from a tenant system 202 (FIG. 2) toa host system 230 (FIG. 2), according to an embodiment of the presentdisclosure. The exemplary hosted service system is a delegated hostedservice system 200 as described in FIG. 2 and it includes the hostsystem 230 and a tenant system 202. It should be noted that according toanother embodiment of the present disclosure, the transmission of thesensitive data from a tenant system 302 to a host system 330 can beperformed using a federated hosted service system 300 as described inFIG. 3.

As depicted in block 502, a user of a client 204 (FIG. 2) isauthenticated, wherein the tenant system 202 includes the client 204.The authentication is performed by a user registry and access controlmanagement element (UR-ACM) 232 (FIG. 2). The host system 230 includesthe UR-ACM 232. Block 504 depicts a proxy 206 (FIG. 2) receiving aclient request 208 (FIG. 2) from the client 204. The tenant system 202includes the client 204 and the proxy 206. Block 506 depicts determiningif a part of the client request 208 is associated with the sensitivedata, wherein the determination is performed by a metadata servicesystem (MSS) 236 (FIG. 2). The MSS 236 is adapted to maintain metadataof the sensitive data, and the metadata includes encryption information.If the part of the client request 208 is associated with the sensitivedata, then the proxy 206 receives at least one encryption keycorresponding to the part of the client request 208 from a keymanagement system (KMS) 234 (FIG. 2).

The KMS 234 is adapted to function as a repository of encryption keysand the encryption keys are used to encrypt the sensitive data. Thesensitive data part of the client request 208 is encrypted using the atleast one encryption key corresponding to the sensitive data part of theclient request 208 and a modified client request is generated, whereinthe modified client request includes the encrypted sensitive data partof the client request 208. Block 508 depicts proxy 206 generating atenant request 212 by manipulating at least one of the client request208 or the modified client request, wherein the manipulation may beperformed using a data exchange format. Block 510 depicts the proxy 206transmitting the tenant request 212 to the host system 230. Block 512depicts routing the tenant request 212 as a query 252. This routing maybe performed by a request builder 242 (FIG. 2), wherein the requestbuilder 242 is a part of a processing application 238 (FIG. 2) and thehost system 230 includes the processing application 238.

Block 514 depicts a query pre-parser 250 (FIG. 2) receiving the query252. The host system 230 includes the query pre-parser 250. Block 516depicts determining if the query 252 received by the query pre-parser250 has a part of the query 252 associated with the sensitive data,wherein the determination is performed by the MSS 236. If the part ofthe query 252 is associated with the sensitive data, then the querypre-parser 250 receives from the KMS 234 at least one encryption keycorresponding to the sensitive data part of the query 252, decrypts thesensitive data part of the query 252 using the at least one encryptionkey corresponding to the sensitive data part of the query 252, andgenerates a modified query where the modified query includes thedecrypted sensitive data part of the query 252. Block 518 depictsgenerating a database query (DB query) 254 (FIG. 2) using at least oneof the query 252 or the modified query. Block 520 depicts the querypre-parser 250 transmitting the DB query 254 to a database 248 (FIG. 2)wherein the host system 230 includes the database 248.

It should be noted that according to another embodiment of thedisclosure, the transmission of the sensitive data from a tenant system202 of FIG. 2 to a host system 230 of FIG. 2 and/or from a tenant system302 of FIG. 3 to a host system 330 of FIG. 3, and, substantiallysimultaneously where the sensitive data is being fetched from a hostsystem 230 of FIG. 2 or 330 of FIG. 3, can be performed using thedelegated hosted service system as described in FIG. 2 as well as afederated hosted service system as described in FIG. 3, respectively.

It should be noted that according to an embodiment of the disclosure, asystem rendered as a delegated hosted service system includes a firstsystem and a second system communicatively coupled to each other via anetwork. In one exemplary embodiment of the present disclosure, thefirst system is equivalent of and has all the elements and components ofthe host system 230 as described in FIG. 2. The second system isequivalent of and has all the elements and components of the tenantsystem 202 as described in FIG. 2.

FIG. 6 is a block diagram of an exemplary computer system 600 that canbe used for implementing various embodiments of the present disclosure.In some embodiments, the computer system 600 can be used as the tenantsystem 202 of FIG. 2 and/or the tenant system 302 of FIG. 3. In someembodiments, the computer system 600 can be used as the host system 230as shown in FIG. 2 and/or the host system 330 of FIG. 3. In otherembodiments, the computer system 600 can be used as the DBMS 244 asshown in FIG. 2 and/or FIG. 3. FIG. 6 is a block diagram of an exemplarycomputing system, for example, such as a desktop computer, laptopcomputer, PDA, mobile phone and the like, that can be used forimplementing exemplary embodiments of the present disclosure describedin FIG. 2 to FIG. 5.

The computer system 600 includes a processor 604. It should beunderstood that although FIG. 6 illustrates a processor, one skilled inthe art would appreciate that more than one processor can be included,or the number of processors can be increased or decreased on anas-needed basis. The processor 604 is connected to a communicationinfrastructure 602 (for example, a communications bus, cross-over bar,or network). Various software embodiments are described in terms of thisexemplary computer system. After reading this description, it willbecome apparent to a person of ordinary skill in the relevant art(s) howto implement the present disclosure using other computer systems and/orcomputer architectures.

Exemplary computer system 600 can include a display interface 608configured to forward graphics, text, and other data from thecommunication infrastructure 602 (or from a frame buffer not shown) fordisplay on a display unit 610. The computer system 300 also includes amain memory 606, which can be random access memory (RAM), and may alsoinclude a secondary memory 612. The secondary memory 612 may include,for example, a hard disk drive 614 and/or a removable storage drive 616,representing a floppy disk drive, a magnetic tape drive, an optical diskdrive, etc. The removable storage drive 616 reads from and/or writes toa removable storage unit 618 in a manner well known to those havingordinary skill in the art. The removable storage unit 618, represents,for example, a floppy disk, magnetic tape, optical disk, etc. which isread by and written to by the removable storage drive 616. As will beappreciated, the removable storage unit 618 includes a computer usablestorage medium having stored therein computer software and/or data.

In exemplary embodiments, the secondary memory 612 may include othersimilar means for allowing computer programs or other instructions to beloaded into the computer system. Such means may include, for example, aremovable storage unit 622 and an interface 620. Examples of such mayinclude a program cartridge and cartridge interface (such as that foundin video game devices), a removable memory chip (such as an EPROM, orPROM) and associated socket, and other removable storage units 622 andinterfaces 620 which allow software and data to be transferred from theremovable storage unit 622 to the computer system 600.

The computer system 600 may also include a communications interface 624.The communications interface 624 allows software and data to betransferred between the computer system and external devices. Examplesof the communications interface 624 may include a modem, a networkinterface (such as an Ethernet card), a communications port, a PCMCIAslot and card, etc. Software and data transferred via the communicationsinterface 624 are in the form of signals which may be, for example,electronic, electromagnetic, optical, or other signals capable of beingreceived by communications interface 624. These signals are provided tothe communications interface 624 via a communications path (that is,channel) 626. The channel 626 carries signals and may be implementedusing wire or cable, fiber optics, a phone line, a cellular phone link,an RF link, and/or other communications channels.

As will be appreciated by one skilled in the art, the present inventionmay be embodied as a system, method, or computer program product.Accordingly, aspects of the present invention may take the form of anentirely hardware embodiment, an entirely software embodiment (includingfirmware, resident software, micro-code, etc.) or an embodimentcombining software and hardware aspects that may all generally bereferred to herein as a “circuit,” “module” or “system.” Furthermore,aspects of the present invention may take the form of a computer programproduct embodied in any one or more computer readable medium(s) havingcomputer usable program code embodied thereon.

Any combination of one or more computer readable medium(s) may beutilized. The computer readable medium may be a computer readable signalmedium or a computer readable storage medium. A computer readablestorage medium may be, for example, but not limited to, an electronic,magnetic, optical, electromagnetic, infrared, or semiconductor system,apparatus, device, or any suitable combination of the foregoing. Morespecific examples (a non-exhaustive list) of the computer readablemedium would include the following: an electrical connection having oneor more wires, a portable computer diskette, a hard disk, a randomaccess memory (RAM), a read-only memory (ROM), an erasable programmableread-only memory (EPROM or Flash memory), an optical fiber, a portablecompact disc read-only memory (CDROM), an optical storage device, amagnetic storage device, or any suitable combination of the foregoing.In the context of this document, a computer readable storage medium maybe any tangible medium that can contain or store a program for use by orin connection with an instruction execution system, apparatus, ordevice.

A computer readable signal medium may include a propagated data signalwith computer readable program code embodied therein, for example, in abaseband or as part of a carrier wave. Such a propagated signal may takeany of a variety of forms, including, but not limited to,electro-magnetic, optical, or any suitable combination thereof. Acomputer readable signal medium may be any computer readable medium thatis not a computer readable storage medium and that can communicate,propagate, or transport a program for use by or in connection with aninstruction execution system, apparatus, or device.

Computer code embodied on a computer readable medium may be transmittedusing any appropriate medium, including but not limited to wireless,wireline, optical fiber cable, radio frequency (RF), etc., or anysuitable combination thereof.

Computer program code for carrying out operations for aspects of thepresent invention may be written in any combination of one or moreprogramming languages, including an object oriented programming languagesuch as Java™, Smalltalk′, C++, or the like, and conventional proceduralprogramming languages, such as the “C” programming language or similarprogramming languages. The program code may execute entirely on theuser's computer, partly on the user's computer, as a stand-alonesoftware package, partly on the user's computer and partly on a remotecomputer, or entirely on the remote computer or server. In the latterscenario, the remote computer may be connected to the user's computerthrough any type of network, including a local area network (LAN) or awide area network (WAN), or the connection may be made to an externalcomputer (for example, through the Internet using an Internet ServiceProvider).

Aspects of the present invention are described below with reference toflowchart illustrations and/or block diagrams of methods, apparatus(systems) and computer program products according to the illustrativeembodiments of the invention. It will be understood that each block ofthe flowchart illustrations and/or block diagrams, and combinations ofblocks in the flowchart illustrations and/or block diagrams, can beimplemented by computer program instructions. These computer programinstructions may be provided to a processor of a general purposecomputer, special purpose computer, or other programmable dataprocessing apparatus to produce a machine, such that the instructions,which execute via the processor of the computer or other programmabledata processing apparatus, create means for implementing thefunctions/acts specified in the flowchart and/or block diagram block orblocks.

These computer program instructions may also be stored in a computerreadable medium that can direct a computer, other programmable dataprocessing apparatus, or other devices to function in a particularmanner, such that the instructions stored in the computer readablemedium produce an article of manufacture including instructions thatimplement the function/act specified in the flowchart and/or blockdiagram block or blocks.

The computer program instructions may also be loaded onto a computer,other programmable data processing apparatus, or other devices to causea series of operational steps to be performed on the computer, otherprogrammable apparatus, or other devices to produce a computerimplemented process such that the instructions which execute on thecomputer or other programmable apparatus provide processes forimplementing the functions/acts specified in the flowchart and/or blockdiagram block or blocks.

The flowchart and block diagrams in the figures illustrate thearchitecture, functionality, and operation of possible implementationsof systems, methods and computer program products according to variousembodiments of the present invention. In this regard, each block in theflowchart or block diagrams may represent a module, segment, or portionof code, which comprises one or more executable instructions forimplementing the specified logical function(s). It should also be notedthat, in some alternative implementations, the functions noted in theblock may occur out of the order noted in the figures. For example, twoblocks shown in succession may, in fact, be executed substantiallyconcurrently, or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved. It will also be notedthat each block of the block diagrams and/or flowchart illustration, andcombinations of blocks in the block diagrams and/or flowchartillustration, can be implemented by special purpose hardware-basedsystems that perform the specified functions or acts, or combinations ofspecial purpose hardware and computer instructions.

It can be appreciated that the illustrative embodiments may be utilizedin many different types of data processing environments including adistributed data processing environment, a single data processingdevice, or the like.

Computer programs (also referred to herein as computer control logic)are stored in the main memory 606 and/or the secondary memory 612.Computer programs may also be received via the communications interface624. Such computer programs, when executed, can enable the computersystem to perform the features of exemplary embodiments of the presentinvention as discussed herein. In particular, the computer programs,when executed, enable the processor 604 to perform the features of thecomputer system 600. Accordingly, such computer programs representcontrollers of the computer system.

The terms “certain embodiments”, “an embodiment”, “embodiment”,“embodiments”, “the embodiment”, “the embodiments”, “one or moreembodiments”, “some embodiments”, and “one embodiment” mean one or more(but not all) embodiments unless expressly specified otherwise. Theterms “including”, “comprising”, “having” and variations thereof mean“including but not limited to”, unless expressly specified otherwise.The enumerated listing of items does not imply that any or all of theitems are mutually exclusive, unless expressly specified otherwise. Theterms “a”, “an” and “the” mean “one or more”, unless expressly specifiedotherwise.

Elements that are in communication with each other need not be incontinuous communication with each other, unless expressly specifiedotherwise. In addition, elements that are in communication with eachother may communicate directly or indirectly through one or moreintermediaries. Additionally, a description of an embodiment withseveral components in communication with each other does not imply thatall such components are required. On the contrary a variety of optionalcomponents are described to illustrate the wide variety of possibleembodiments.

When a single element or article is described herein, it will beapparent that more than one element/article (whether or not theycooperate) may be used in place of a single element/article. Similarly,where more than one element or article is described herein (whether ornot they cooperate), it will be apparent that a single element/articlemay be used in place of the more than one element or article. Thefunctionality and/or the features of an element may be alternativelyembodied by one or more other elements which are not explicitlydescribed as having such functionality/features. Thus, other embodimentsneed not include the element itself.

Computer program means or computer program in the present context meanany expression, in any language, code or notation, of a set ofinstructions intended to cause a system having an information processingcapability to perform a particular function either directly or aftereither or both of the following a) conversion to another language, codeor notation; b) reproduction in a different material form.

Although exemplary embodiments of the present disclosure have beendescribed in detail, it should be understood that various changes,substitutions and alternations could be made thereto without departingfrom spirit and scope of the inventions as defined by the appendedclaims. Variations described for exemplary embodiments of the presentdisclosure can be realized in any combination desirable for eachparticular application. Thus particular limitations, and/or embodimentenhancements described herein, which may have particular advantages to aparticular application, need not be used for all applications. Also, notall limitations need be implemented in methods, systems, and/orapparatuses including one or more concepts described with relation toexemplary embodiments of the present disclosure.

What is claimed is:
 1. A hosted service system for protecting sensitivedata, the system comprising: a host computer system having a hardwareprocessor, wherein the host system includes: a key management system(KMS); a metadata service system (MSS), wherein the KMS and the MSS arecommunicatively coupled to each other; and a database management system(DBMS), the DBMS having: a database; a query pre-parser; and a resultshandler, wherein the query pre-parser and the results handler arecommunicatively coupled to the KMS and the MSS; and a processingapplication adapted to process at least some data received from a tenantsystem.
 2. The system of claim 1, wherein the query pre-parser isadapted to receive a query, and wherein the MSS is adapted to determineif the query received by the query pre-parser has a part of the queryassociated with sensitive data of the tenant system, wherein thesensitive data is at least a part of the data of the tenant system. 3.The system of claim 1, wherein the KMS is adapted to: function as arepository of encryption keys, the encryption keys being used to encryptsensitive data of the tenant system, wherein the sensitive data is atleast a part of the data of the tenant system; and wherein the MSS isadapted to maintain metadata of the sensitive data, wherein the metadataincludes encryption information.
 4. The system of claim 3, wherein atleast one encryption key is administered by the tenant system.
 5. Thesystem of claim 3, wherein the query pre-parser is adapted to: receive aquery; determine if the query received by the query pre-parser has apart of the query associated with the sensitive data, wherein thedetermination is performed by the MSS; if the part of the query isassociated with the sensitive data: receive, from the KMS, at least oneencryption key corresponding to the part of the query; decrypt the partof the query using the at least one encryption key corresponding to thepart of the query; and generate a modified query, wherein the modifiedquery includes the decrypted part of the query; generate a databasequery (DB query) using at least one of the query or the modified query;and transmit the DB query to the database.
 6. The system of claim 3,wherein the results handler is adapted to: receive a database queryresult (DB query result) from the database; determine if a part of theDB query result is associated with the sensitive data, wherein thedetermination is performed by the MSS; if the part of the DB queryresult is associated with the sensitive data: receive, from the KMS, atleast one encryption key corresponding to the part of the DB queryresult; encrypt the part of the DB query result using the at least oneencryption key corresponding to the part of the DB query result; andgenerate a modified DB query result, wherein the modified query resultincludes the encrypted part of the DB query result; generate a queryresult using at least one of the DB query result or the modified DBquery result; and transmit the query result.
 7. The system of claim 3,further comprising: a user registry and access control managementelement (UR-ACM), wherein the UR-ACM is communicatively coupled to theMSS and the KMS, and wherein the UR-ACM is adapted to authenticate auser of a client associated with the tenant system.
 8. The system ofclaim 7, wherein the processing application comprises: a responsebuilder, wherein the response builder is adapted to: process a queryresult from the results handler; and route the processed query result asa host response to the tenant system; and a request builder, wherein therequest builder is adapted to: process a tenant request from the tenantsystem; and route the processed tenant request as a query to the querypre-parser.
 9. The system of claim 8, further comprising: a proxy,wherein the proxy is communicatively coupled to the KMS, the MSS and theUR-ACM, and wherein the proxy is adapted to: receive a client requestfrom the client; determine if a part of the client request is associatedwith the sensitive data, wherein the determination is performed by theMSS; if the part of the client request is associated with the sensitivedata: receive, from the KMS, at least one encryption key correspondingto the part of the client request; encrypt the part of the clientrequest using the at least one encryption key corresponding to the partof the client request; and generate a modified client request, whereinthe modified client request includes the encrypted part of the clientrequest; generate a tenant request by manipulating at least one of theclient request or the modified client request, wherein the manipulationis performed using a data exchange format; and transmit the tenantrequest.
 10. The system of claim 9, wherein the proxy is further adaptedto: receive a host response; determine if a part of the host response isassociated with the sensitive data, wherein the determination isperformed by the MSS; if the part of the host response is associatedwith the sensitive data: receive, from the KMS, at least one encryptionkey corresponding to the part of the host response; decrypt the part ofthe host response using the at least one encryption key corresponding tothe part of the host response; and generate a modified host response,wherein the modified host response includes the decrypted part of thehost response; generate a client response by manipulating at least oneof the host response or the modified host response, wherein themanipulation is performed using a data exchange format; and transmit theclient response to the client.
 11. The system of claim 10, wherein theprocessing application is communicatively coupled to: the KMS; the MSS;and the UR-ACM.
 12. A hosted service system for protecting sensitivedata, the system comprising: a host computer system having a hardwareprocessor, wherein the host system includes: a federation server; and adatabase management system (DBMS), the DBMS having: a database; a querypre-parser, wherein the query pre-parser is adapted to receive, via thefederation server, communications from a key management system (KMS) anda metadata service system (MSS) associated with a tenant system wherethe host system is adapted to process at least some of the data of thetenant system, and wherein the query pre-parser is adapted to: receive aquery; receive, from the MSS, a determination if the query received bythe query pre-parser has a part of the query associated with thesensitive data; if the part of the query is associated with thesensitive data: receive, from the KMS, at least one encryption keycorresponding to the part of the query; decrypt the part of the queryusing the at least one encryption key corresponding to the part of thequery; and generate a modified query, wherein the modified queryincludes the decrypted part of the query; generate a database query (DBquery) using at least one of the query or the modified query; andtransmit the DB query to the database; and  a results handler, whereinthe query pre-parser and the results handler are both communicativelycoupled to the federation server.
 13. The system of claim 12, whereinthe KMS is adapted to: function as a repository of encryption keys, theencryption keys being used to encrypt sensitive data of the tenantsystem, wherein the sensitive data is at least a part of the data of thetenant system; and wherein the MSS is adapted to: maintain metadata ofthe sensitive data, wherein the metadata includes encryptioninformation; and wherein the results handler is communicatively coupledto the MSS and the KMS via the federation server, and wherein theresults handler is adapted to: receive a database query result (DB queryresult) from the database; determine if a part of the DB query result isassociated with the sensitive data, wherein the determination isperformed by the MSS; if the part of the DB query result is associatedwith the sensitive data: receive, from the KMS, at least one encryptionkey corresponding to the part of the DB query result; encrypt the partof the DB query result using the at least one encryption keycorresponding to the part of the DB query result; and generate amodified DB query result, wherein the modified query result includes theencrypted part of the DB query result; generate a query result using atleast one of the DB query result or the modified DB query result; andtransmit the query result.
 14. The system of claim 13, furthercomprising: a user registry and access control management element(UR-ACM), wherein the UR-ACM being communicatively coupled to thefederation server, and wherein the UR-ACM is adapted to authenticate auser of a client associated with the tenant system.
 15. The system ofclaim 14, further comprising: a processing application communicativelycoupled to the federation server and the UR-ACM, wherein the host systemincludes the processing application, and wherein the processingapplication includes: a response builder, wherein the response builderis adapted to: process a query result from the results handler; androute the processed query result as a host response to the tenantsystem; and a request builder, wherein the request builder is adaptedto: process a tenant request from the tenant system; and route theprocessed tenant request as a query to the query pre-parser.
 16. Thesystem of claim 15, further comprising: a proxy, wherein the proxy iscommunicatively coupled to the KMS, the MSS, the federation server andthe UR-ACM, and wherein the tenant system includes the proxy, andfurther wherein the proxy is adapted to: receive a client request fromthe client; determine if a part of the client request is associated withthe sensitive data, wherein the determination is performed by the MSS;if the part of the client request is associated with the sensitive data:receive, from the KMS, at least one encryption key corresponding to thepart of the client request; encrypt the part of the client request usingthe at least one encryption key corresponding to the part of the clientrequest; and generate a modified client request, wherein the modifiedclient request includes the encrypted part of the client request;generate a tenant request by manipulating at least one of the clientrequest or the modified client request, wherein the manipulation isperformed using a data exchange format; transmit the tenant request;receive a host response; determine if a part of the host response isassociated with the sensitive data, wherein the determination isperformed by the MSS; if the part of the host response is associatedwith the sensitive data: receive, from the KMS, at least one encryptionkey corresponding to the part of the host response; decrypt the part ofthe host response using the at least one encryption key corresponding tothe part of the host response; and generate a modified host response,wherein the modified host response includes the decrypted part of thehost response; generate a client response by manipulating at least oneof the host response or the modified host response, wherein themanipulation is performed using a data exchange format; and transmit theclient response to the client.
 17. A system for protecting data, thesystem comprising: a first computer system having a hardware processor,wherein the first system includes: a key management system (KMS); ametadata service system (MSS), wherein the KMS and the MSS arecommunicatively coupled to each other; and a database management system(DBMS), the DBMS having: a database; a query pre-parser; and a resultshandler, wherein the query pre-parser and the results handler arecommunicatively coupled to the KMS and the MSS; and wherein the firstsystem is adapted to receive, via a network, data from a second systemhaving an associated client, and wherein the first system is adapted toprocess at least some data of the second system.
 18. The system of claim17, wherein the query pre-parser is adapted to receive a query, andwherein the MSS is adapted to determine if the query received by thequery pre-parser has a part of the query associated with sensitive dataof the tenant system, wherein the sensitive data is at least a part ofthe data of the tenant system.
 19. The system of claim 17, wherein theKMS is adapted to: function as a repository of encryption keys, theencryption keys being used to encrypt sensitive data of the secondsystem, wherein the sensitive data is at least a part of the data of thesecond system; the MSS is adapted to: maintain metadata of the sensitivedata, wherein the metadata includes encryption information; the querypre-parser is adapted to: receive a query; determine if the queryreceived by the query pre-parser has a part of the query associated withthe sensitive data, wherein the determination is performed by the MSS;if the part of the query is associated with the sensitive data: receive,from the KMS, at least one encryption key corresponding to the part ofthe query; decrypt the part of the query using the at least oneencryption key corresponding to the part of the query; and generate amodified query, wherein the modified query includes the decrypted partof the query; generate a database query (DB query) using at least one ofthe query or the modified query; and transmit the DB query to thedatabase; and wherein the results handler is adapted to: receive adatabase query result (DB query result) from the database; determine ifa part of the DB query result is associated with the sensitive data,wherein the determination is performed by the MSS; if the part of the DBquery result is associated with the sensitive data: receive, from theKMS, at least one encryption key corresponding to the part of the DBquery result; encrypt the part of the DB query result using the at leastone encryption key corresponding to the part of the DB query result; andgenerate a modified DB query result, wherein the modified query resultincludes the encrypted part of the DB query result; generate a queryresult using at least one of the DB query result or the modified DBquery result; and transmit the query result.
 20. The system of claim 18,further comprising: a user registry and access control managementelement (UR-ACM), wherein the first system includes the UR-ACM, andwherein the UR-ACM is communicatively coupled to the MSS and the KMS,and further wherein the UR-ACM is adapted to authenticate a user of theclient; a processing application, wherein the processing application iscommunicatively coupled to the MSS, the UR-ACM and the KMS, and whereinthe first system includes the processing application, and furtherwherein the processing application includes: a response builder, whereinthe response builder is adapted to: process a query result from theresults handler; and route the processed query result as a host responseto the second system; and a request builder, wherein the request builderis adapted to: process a tenant request from the second system; androute the processed tenant request as a query to the query pre-parser;and a proxy, wherein the proxy is communicatively coupled to the KMS,the MSS and the UR-ACM, and wherein the second system includes theproxy, and further wherein the proxy is adapted to: receive a clientrequest from the client; determine if a part of the client request isassociated with the sensitive data, and wherein the determination isperformed by the MSS; if the part of the client request is associatedwith the sensitive data: receive, from the KMS, at least one encryptionkey corresponding to the part of the client request; encrypt the part ofthe client request using the at least one encryption key correspondingto the part of the client request; and generate a modified clientrequest, wherein the modified client request includes the encrypted partof the client request; generate a tenant request by manipulating atleast one of the client request or the modified client request, whereinthe manipulation is performed using a data exchange format; transmit thetenant request; receive a host response; determine if a part of the hostresponse is associated with the sensitive data, wherein thedetermination is performed by the MSS; if the part of the host responseis associated with the sensitive data: receive, from the KMS, at leastone encryption key corresponding to the part of the host response;decrypt the part of the host response using the at least one encryptionkey corresponding to the part of the host response; and generate amodified host response, wherein the modified host response includes thedecrypted part of the host response; generate a client response bymanipulating at least one of the host response or the modified hostresponse, wherein the manipulation is performed using a data exchangeformat; and transmit the client response to the client.